Loans Receivable: Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,119,536	$ 1,117,410
Deferred loan fees, net (2)	418	1,654
Loans receivable, allowance	15,657	15,174
Loans receivable, net	1,103,461	1,100,582
Unamortized loan purchase premiums	3,300
One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	385,116	381,960
One-to-four family, residential, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	185,320	206,323
One-to-four family residential non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	199,796	175,637
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, allowance	1,279	1,366	$ 1,607
Multifamily Permanent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	130,146	136,694
Multifamily Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans excluded from category	37,200	51,200
Commercial Real Estate Permanent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	419,417	385,265
Construction Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	93,455	92,207
Loans receivable, allowance	2,064	2,189	2,222
Construction/Land Development One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	34,677	33,396
Construction Land Development Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	37,194	51,215
Construction Land Development Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,189	5,783
Loans excluded from category	12,900	1,800
Construction Land Development Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,395	1,813
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	46,590	80,663
Loans receivable, allowance	1,112	1,242	1,140
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	44,812	40,621
Loans receivable, allowance	$ 1,373	$ 1,069	$ 656